Actively exploited in the wild
Collabora Online – Built-in CODE Server OS Command Injection Vulnerability
Collabora - Collabora Online – Built-in CODE Server · Listed in the CISA KEV since 2026-10-23. This indicates confirmed attacks in production environments.
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CVE-2026-110447
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Very high risk99th percentile - higher than 99% of all known CVEs
Summary
Collabora Online Built-in CODE Server before version 26.4.303 (richdocumentscode), a Nextcloud app, allows remote code execution, exploited in the wild in September and October 2026. This is an OS command injection in proxy.php when the CODE server isn't running. The vulnerability is not present in standalone Collabora Online servers.
Risk Assessment
An attacker can execute arbitrary commands on the server, potentially leading to full system and data compromise.
Recommendation
Update Collabora Online Built-in CODE Server to version 26.4.303 or later. Ensure the CODE server is always running to reduce risk.
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Original NVD description (English source)
Collabora Online Built-in CODE Server before 26.4.303 (richdocumentscode), a Nextcloud app, allows remote code execution, as exploited in the wild in September and October 2026, a different vulnerability than CVE-2025-66208. This is an OS command injection in proxy.php when the CODE server isn't running (e.g., the product was recently restarted). The vulnerability is not present in standalone Collabora Online servers; only this deployment with CODE Server is affected.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

